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# ELISABETTA BILLOTTA

Last seen: 2 maanden ago Active since 2021

PhD Student

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Question

randomly sample a pair of values in a double
I have two doubles of the type coord_iso=65x2 double and coord_ce=65x2 double (they are all pairs of geographic coordinates). I...

2 maanden ago | 2 answers | 0

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Question

I have an image (a DEM.tif) inserted in the above script where I plotted a map created with contourf. the code is: [AA,EE]=geot...

2 maanden ago | 2 answers | 0

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how to recreate excel table in matlab
I have a problem. I have attached an excel file to make you understand what I have to do: I have to get in matlab a table/stru...

3 maanden ago | 1 answer | 0

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calculate distances starting from file.mat double
Hello everybody. I have a problem. I have a .mat file of this type (hatepe_dec.mat is an example) with 4 other .mat files (dou...

3 maanden ago | 1 answer | 0

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how to write values with dms2degrees
what i have to do is insert an excel table where the coordinates are in degrees, minutes and seconds and convert it to decimal d...

3 maanden ago | 1 answer | 0

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Question

how to extend a straight line through two points to the y-axis of the plane
I have a graph of this type and I have created the straight line dashed in red that passes through the point of coordinates 0-0 ...

4 maanden ago | 0 answers | 0

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how to extend a straight line passing through two points until it meets the y axis of the Cartesian plane
I have a graph of this type and I have created the straight line dashed in red that passes through the point of coordinates 0-...

4 maanden ago | 2 answers | 0

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Question

Operator '>' is not supported for operands of type 'struct'
i have two struct xin_s and yin_s and i need a1 and a2. i wrote: lonsorgente = 14.2; latsorgente = 40.8; a1= xin_s > lonsorge...

7 maanden ago | 2 answers | 0

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how to create a STRUCTURE composed of variables from .NC files
I have a very heavy set of .NC files (ERA 5 from Copernicus) to use within other scripts. They are the data relating to the char...

7 maanden ago | 1 answer | 0

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Question

to build a table with XYZ values
I have to build a table in csv format (to be used later in qgis) with 3 values of which XX = longitudes , YY = are latitudes and...

7 maanden ago | 3 answers | 0

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Question

how to transform files drom double to struct
i need to estrapolate data from matlab and use them in Qgis. I need shapefile data and with shapewrite it doesn't work. cont...

7 maanden ago | 1 answer | 0

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Question

how to transform files into shapefile for qgis
I need to extrapolate some values to then be able to plot them on QGIS over a DEM. I wrote with che command shapewrite: conto...

7 maanden ago | 0 answers | 0

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convert matlab results into a format useful for Qgis
I have a series of matrices which are the result of various operations and I have a graph produced with the contourf function wh...

7 maanden ago | 0 answers | 0

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how to remove values below 0.1?
after doing a series of calculations I obtained a prob(i)=1x27331 double matrix characterized by values ranging from 0 to about ...

8 maanden ago | 2 answers | 0

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Question

how to view data on a DEM-readhgt
Through the READHGT function I was able to download the DEM data of an area of interest. above this DEM I have to load the maps ...

9 maanden ago | 0 answers | 0

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Question

how to find intersection point in arrays with for cycle?
I built such a grid: longrd=0:0.1:40; latgrd=25:0.1:65; limlon=[min(longrd),max(longrd)]; limlat=[min(latg...

11 maanden ago | 1 answer | 0

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Question

extrapolate values from matrices and graphs
I have a chart of this type which derives from this script: for i=1:length(longrd) for j=1:length(latgrd) XX(i,...

11 maanden ago | 1 answer | 0

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Question

how to display ranges of numbers
I have a script like: alpha_x = sqrt (x1-x2) / 6; beta_x = log (x2 + x1) / 7; epsilon_x = mean (alpha, beta); how do i vie...

11 maanden ago | 1 answer | 0

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Question

calculate the minimum probability
I have in one case two matrices and in the other case three matrices of size 2922x1. the values within the matrices are probabil...

ongeveer een jaar ago | 2 answers | 0

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plot in logarithmic scale
can someone tell me how in a 3d graph I can plot linearly the X and Y axis, while the Z axis (ZZ in this case) to plot it in log...

ongeveer een jaar ago | 2 answers | 0

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Question

smoothing of a 2d distribution
Hello, what I would like to do is try to smooth and make this map more homogeneous and in particular the probability values,...

ongeveer een jaar ago | 1 answer | 0

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Question

does anyone know a command that allows me to plot the world map but with the coordinates in radians and not with degrees ??? t...

ongeveer een jaar ago | 0 answers | 0

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Question

how to smooth the corners of a map
I have a map of this type generated with the command "contourf(XX,YY,ZZ);" where XX is the longitude value, YY is the latitud...

meer dan een jaar ago | 1 answer | 0

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Question

to solve the problem: Index in position 1 exceeds array bounds. Index must not exceed 10
i have this code: x = [0 0 71 355 676]; v = [0 7 30 70]; xq = z1; ...

meer dan een jaar ago | 1 answer | 0

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Question

summations and selections of the columns of a matrix
I have a matrix of this type 10 15 37 16 6 4 3 5 15 66 85 96 17 89 15 82 58 66 78 100 I have to ...

meer dan een jaar ago | 1 answer | 0

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Question

how can i fix this error "Array indices must be positive integers or logical values"?
knowing that z2 is a function that determines the angles, vq2 are velocities determined with interpolation, d are reference angl...

meer dan een jaar ago | 1 answer | 0

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Question

how to connect interpolation and probability
starting from 3 distance values and 3 speed values I managed to create this grid by interpolating all the values (the colored ...

meer dan een jaar ago | 1 answer | 0

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Question

calculate distance and angles between points in a grid
I have created a grid of this type where for each point I know the coordinates and each point of the grid is one degree both i...

meer dan een jaar ago | 1 answer | 0

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how to INTERPOLATE starting from three circles
Through the information of 3 distances and 3 wind speeds I was able to create circles as shown in the figure where each point ...

meer dan een jaar ago | 1 answer | 0